161534440 has 32 divisors (see below), whose sum is σ = 364320000. Its totient is φ = 64459584.

The previous prime is 161534423. The next prime is 161534479. The reversal of 161534440 is 44435161.

161534440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161534440² = 52186750612227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161534399 and 161534408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12961 + ... + 22159.

It is an arithmetic number, because the mean of its divisors is an integer number (11385000).

Almost surely, 2^161534440 is an apocalyptic number.

161534440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161534440 is an abundant number, since it is smaller than the sum of its proper divisors (202785560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161534440 is a wasteful number, since it uses less digits than its factorization.

161534440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649 (or 9645 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 161534440 is about 12709.6199785832. The cubic root of 161534440 is about 544.6134677519.

The spelling of 161534440 in words is "one hundred sixty-one million, five hundred thirty-four thousand, four hundred forty".